The online manual has the specs for this unit here.
<ADMIN NOTE: Broken link has been removed from this post by Dell>
It's not fancy, but it's a desktop intended for corporate users, so sound usually doesn't need to have super high standards/requirements. For this Dell offers the Inspiron desktops, XPS desktops and Precision Workstations.
Member since 2003
Not all cards are created equal.
You Must use a PCI 2.2 or PCI 2.3 universal Card with 2 Keyways in the PCI slot.
Otherwise you have an issue with 5V PCI not working in 3.3v PCI slots.
The most trouble free sound cards are the Turtle Beach Amigo.
They are USB and not Cards that plug into the slots and cause Power or IRQ or other issues.
PCI 2.2 or PCI 2.3 (UNIVERSAL PCI) cards have 2 Keyways in the slot.